Collision process of a bead on a two-dimensional bead packing: Importance of the inter-granular contacts
2003
Rioual, François | Valance, Alexandre | Bideau, D | Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE) | Institut de Physique de Rennes (IPR) ; Université de Rennes (UR)-Centre National de la Recherche Scientifique (CNRS) | Groupe matière condensée et matériaux (GMCM) ; Université de Rennes (UR)-Centre National de la Recherche Scientifique (CNRS)
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Show more [+] Less [-]English. The collision of an impacting bead on a 2D bead packing is experimentally investigated. It is found that the energy dissipated in the collision is strongly dependent on the density of inter-granular contacts in the packing. We show indeed that the energy released by the packing after the impact is increased when the density of inter-grain contacts is lowered. This increase manifests itself by means of an important augmentation of the number of grains ejected from the packing. In addition, we propose a phenomenological description of the propagation of the shock wave (induced by the impacting bead) through the packing. This description is inspired from percolation models and provides a plausible explanation for the increase of the energy released by a packing with a low density of inter-grain contacts.
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